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SCHOOL ENTOMOLOGY 



worm. When several colonies occur on a tree the caterpillars 

 will soon strip it of foliage, and not infrequently neglected 

 trees will be more or less defoliated every year. The cater- 

 pillars become grown in about six weeks and are then two 

 inches long, deep black in color, with a white stripe down the 

 back, and on each side of each segment is an oval pale blue 



L IG. 227. -bgg mass of tlie 

 tent caterpillar. 



FIG. 228. Half-grown tent caterpillars 

 on tent reduced in size. 



spot with a broader velvety black spot immediately in front 

 of it, giving somewhat the effect of an eye-spot. Having 

 found a suitable place under loose bark or rubbish or in a 

 fence corner the caterpillar spins a thin cocoon of tough white 

 silk in which it transforms to the pupa. About three weeks 

 later the adult moths emerge and the females lay their eggs 

 on the tips of the twigs. The moths are of a brownish color, 



